February 7th

Let´s continue with statistics:

First of all, check this test about graphs now (if you couldn´t do it last week).

MEASURES OF CENTRAL TENDENCY
We´ve already learned what Sigma Notation was. You can practice it with these exercises.

Remember the definitions with this activity or check this video again:



Now you can practice the central tendency measures at the Museum of Aztec Art.
And finally a test.

January 31st

Today it´s about statistics.

Collecting data
Listen to this and solve the activity about tables and bar charts.
A first test.

GRAPHS AND DIAGRAMS
About pie charts: learn here what a pie chart is and how you draw one .

1. With Valentine´s Day just around the corner, this exercise just seemed appropiate: try and answer the questions.
2. And one with some vocabulary.

We can draw graphs using OpenOffice´s Calc:
After selecting the data on the spreadsheet, go to "Insert" and then "Chart". Select the kind of graph you´re interested in and the program would do the rest. You can modify the graph by addind a title, changing colors or the legend, etcetera.
3. Use the data on the page to draw a first pie chart
4. Use the data on the page to draw a second pie chart


About bar charts:
5. Complete the sentences on this one.
6. Use the data on exercise 3 to draw a bar chart using Calc.


About frequency polygons:
- An activity about frequency polygons (and more).
- And learn how to draw one (with grouped data):


And finally, a very, very easy test about graphs.

January 10th

Inequalities
As you already know, we use the following symbols:


Solving inequalities
"Solving'' an inequality means finding all of its solutions. A "solution'' of an inequality is a number which when substituted for the variable makes the inequality a true statement.
For example: 2 is a solution of 2x-3<5 because 2·2-3<5

When solving inequalities, there are certain manipulations of the inequality which do not change the solutions:

Rule 1. Adding/subtracting the same number on both sides.

Rule 2. Multiplying/dividing by the same POSITIVE number on both sides.

Rule 3. Multiplying/dividing by the same NEGATIVE number on both sides AND changing the orientation of the inequality sign.

ALWAYS EXPRESS SOLUTIONS AS AN INTERVAL(S)

November 29th

Today, we are solving equations:
1. Biquadratic equations
A biquadratic equation is a quartic equation without odd degree terms; in general,
ax ⁴+bx²+c=0
where a, b and c are real numbers.
To solve it, we use the substitution y=x²; that leads to the quadratic equation ay²+by²+c=0.
Solve these exercises in your notebook and then check your answers on the web.

2. Radical equations
A radical equation is an equation that has at least one variable expression inside a radical, usually a square root. Here you have an explanation on how to solve these equations:

Now try some exercises.

3. Equations involving fractions
Solve these exercises.

4. Simultaneous equations
Do you remember how to solve simultaneous equations? Prove it.

November 8th

Polynomials
We´ve learned about the long and the synthetic division of polynomials, how to factor them and the Remainder and Factor Theorems. It´s time to put that knowledge to the test with some interactive quizzes:
Quiz 1: about synthetic division and the Remainder Theorem.
Quiz 2: factoring polynomials.
Quiz 3: Remainder and Factor Theorem Quiz.

Some extra practice (non-interactive).

Tuesday, October 18th

Last year we studied what scientific notation is. Here it´s the definition and some examples.
And now a TEST.

Adding and subtracting numbers in scientific notation
Watch the explanation.
So, when adding or subtracting in scientific notation, you must express the numbers as the same power of 10. This will often involve changing the decimal place of the coefficient.
For some exercises, try sections G and H on this page. The answers are at the end of that page.

Multiplying and dividing numbers in scientific notation
It´s so much easier. Just multiply or divide the coefficients and the powers of 10. Try the exercises at the end of these pages: multiplication, division.

Tuesday, October 11th

Today it´s about logarithms. We started last week with the definition; let´s remember it with this video.
At this point, you should already know what a common logarithm is or how to work out the value of log 0.001. More info about logs:

Rules of logarithms. Watch this video to learn how to use this rules or properties.

And here you have some examples and exercises.